Now the patch is done, apply a couple of coats of primer, then paint the ceiling. Peeling from plaster could be a result of insufficient wet troweling of the white coat when the plaster was originally applied, causing chalking of the surface. All this sanding will create a mess so cover everything in the area. At the edges use 220 grit sandpaper and you'll be able to create a seamless feathered edge. Now using a sanding block and 120 grit sandpaper sand the patched area smooth paying particular attention to feathering our the edges. Let that dry completely - like leave it alone for 24 hours. After it is thoroughly dry, apply a second layer out 6" beyond the area being repaired - you want this second layer to be a little proud of the surrounding surface and at the edges feather out the DAP as smooth and feathered as you can get. Take about one half of one container of the DAP and scrape it out into the mud pan and using the 10" knife, skim coat the entire area - get enough of a coat on it to level it out with the surface of the surrounding solid surface and then let it thoroughly dry. Spray this over the area of plaster you're sampling from. Fill a hand sprayer with water and a few drops of detergent. What youa re going to do is repalce that smooth setting stuff surface. Up to 90 m 2 (1,000 ft 2) of plaster: Collect 3 samples. Now you'll need a 10" drywall knife, a couple of containers of this compund and a mud pan. Using a straightedge and a razor/box knife, bo back about an inch from where the setting stuff is firmly attached and score the setting stuff fairly deeply, then peel it back to that line. As soon as moisture in the air gets near an. Turns out, the entire house had been painted, 3 times, with bad wall prep. We are in Zone 5 cold temperate Ontario, Canada. We bought an old 1955 house with lath and plaster, and brick veneer. When plaster begins to pull away from the lath, there is a chance it may fall away from the wall or ceiling and come crashing down. These show up on both ceilings and walls, but can be the most dangerous on ceilings. Anyway, I've fixed several areas like that in my old place and what you can do is this: I need to make a decision on the best way to tackle this house. Delaminating Cracks These cracks are a sign of plaster pulling away from the lath behind it. It does look as if you have a bit more to scrape on the bottom left half of the picture. From what I can see in your picture, you have pretty much scraped off most of the delaminated area. Actually what has happened is the finish layer, or the "setting stuff" has delaminated from the plaster.
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